JP3765909B2 - Control device for vehicle air-conditioning device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a control device for an air conditioning device for a vehicle that controls the operation of the air conditioning device when an engine of a vehicle such as an automobile is idling, i.e., at a so-called idle time.
[0002]
[Prior art]
Conventionally, the actual idle speed of the engine (actual idle speed) has fallen below the lower limit target value of the idle speed in order to prevent engine stoppage, that is, engine stop, during operation of the air conditioning device. The air conditioning device is deactivated, and when the actual idle speed is restored to the upper limit target value of the idle speed, the air conditioning device is started again and used for use. A control device for a conditioning device is known (see Japanese Utility Model Laid-Open No. 1-147718).
[0003]
[Problems to be solved by the invention]
However, according to this conventional technique, when control is performed to reduce the engine speed when the load on the air conditioning device is large and the load on the engine is large, the upper limit target of the set speed There is a problem that hunting may occur due to fluctuations in engine rotation between a value (return speed of the air conditioning device) and a lower limit target value (stop speed of the air conditioning device).
[0004]
A technique for solving this problem is proposed in Japanese Patent Laid-Open No. 5-44531. This technology includes so-called idle up control means for increasing the idle speed according to the load of the air conditioning device when the air conditioning device is in operation, and the air conditioning device is stopped at the lower limit target value. Later, there is provided a technique for providing an intake air amount correcting means for increasing and correcting the air amount increase value for idling up in the idle up control means. The idle-up control is a control for idling up the engine by operating the intake air amount correcting means so as to increase the intake air amount to the engine in accordance with the operation and stop of the air conditioning device during idling.
[0005]
However, in the technique described in Japanese Patent Laid-Open No. 5-44531, the air amount is corrected by the intake air amount correcting means after the air conditioner is stopped and the load applied to the engine by the air conditioner is lost. Therefore, it is difficult to set the air increase correction value because the engine speed increases rapidly depending on the air increase correction value and the engine condition, so it is difficult to set the air increase correction value. The control was complicated by making corrections. Furthermore, in any of the techniques disclosed in Japanese Utility Model Laid-Open No. 1-147718 and Japanese Patent Laid-Open No. 5-44531, for example, in a state where the load of the air-conditioning device is small and operating normally, for some reason If the engine speed temporarily falls below the lower limit target value, there is a problem that the air conditioning device stops.
[0006]
Furthermore, in any of the techniques disclosed in Japanese Utility Model Laid-Open No. 1-147718 and Japanese Patent Laid-Open No. 5-44531, for example, at the actual idle speed, the lower limit target value of the idle speed is not reached. If there is a continuous decrease in engine speed that does not occur, the air conditioner will continue to operate, causing the vehicle to vibrate due to engine vibration or the vehicle interior caused by this vibration. There is a problem that the evaluation of so-called functionality becomes low, such as the generation of a booming noise.
[0007]
The present invention has been made in consideration of such problems, and an object of the present invention is to provide a control device for a vehicle air-conditioning device that can effectively perform on / off control of the on-vehicle air-conditioning device during idling. And
[0008]
[Means for Solving the Problems]
For example, as shown in FIG.
A compressor 16 coupled to and driven by the vehicle engine 12;
An electromagnetic clutch 14 connecting the compressor and the vehicle engine;
A rotational speed detection means 18 for detecting the rotational speed of the vehicle engine;
Target idle speed setting means 32a for setting a target idle speed at the time of idling operation of the vehicle engine;
Electromagnetic clutch control means (36, 38, 40) for controlling connection of the electromagnetic clutch based on the rotational speed detected by the rotational speed detection means and the target idle rotational speed set by the target idle rotational speed setting means A control device for an air conditioning apparatus for a vehicle having:
The electromagnetic clutch control means includes
Deviation detecting means 36 and 42 for detecting a deviation between the rotational speed detected by the rotational speed detecting means and the target rotational speed set by the target idle rotational speed setting means;
A deviation comparison means 38 for comparing the deviation detected by the deviation detection means with a predetermined set deviation value;
According to a comparison result of the deviation comparing means, and a time measuring means 40 for measuring a predetermined set time,
The timing means is
The electromagnetic clutch disengagement signal is generated after a state in which the deviation detected by the deviation detecting means is larger than the set deviation value continues for the set time.
It is characterized by that.
[0009]
According to this invention, when the state where the deviation between the target idle speed and the actual idle speed is larger than the set deviation value continues for the set time, the electromagnetic clutch is disconnected and the air conditioning device is deactivated.
[0010]
Further, the present invention, for example, as shown in FIG.
A compressor 16 coupled to and driven by the vehicle engine 12;
An electromagnetic clutch 14 connecting the compressor and the vehicle engine;
A rotational speed detection means 18 for detecting the rotational speed of the vehicle engine;
Target idle speed setting means 32a for setting a target idle speed at the time of idling operation of the vehicle engine;
Air conditioning for vehicles, comprising: electromagnetic clutch control means for controlling connection of the electromagnetic clutch based on the rotational speed detected by the rotational speed detection means and the target idle rotational speed set by the target idle rotational speed setting means A control device for the device,
The electromagnetic clutch control means includes
Deviation detecting means 36 and 42 for detecting a deviation between the rotational speed detected by the rotational speed detecting means and the target rotational speed set by the target idle rotational speed setting means;
A deviation comparison means 38 for comparing the deviation detected by the deviation detection means with a predetermined set deviation value;
First and second time measuring means 40 and 44 for respectively measuring predetermined first and second set times according to the comparison result of the deviation comparing means,
The first time measuring means includes
After a state in which the deviation detected by the deviation detecting means is larger than the set deviation value continues for the first set time, a disconnection signal for the electromagnetic clutch is generated,
The second time measuring means includes
After the electromagnetic clutch is disengaged, the deviation detected by the deviation detecting means is smaller than the set deviation value and smaller than the set deviation value continues for the second set time. Generate a connection signal
It is characterized by that.
[0011]
According to this invention, when the state where the deviation between the target idle speed and the actual idle speed is larger than the set deviation value continues for the set time (first set time), the electromagnetic clutch is disconnected and the air conditioning device After that, when the deviation becomes smaller than the set deviation value and the reduced state continues for the set time (second set time), the electromagnetic clutch is connected to the air conditioning device. Is restored to the operating state.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0013]
FIG. 1 shows a schematic configuration of an automobile 10 as a vehicle to which an embodiment of the present invention is applied.
[0014]
The automobile 10 has an engine 12, and the engine 12 is connected to a compressor 16 constituting an air conditioning device via an electromagnetic clutch 14.
[0015]
The actual rotational speed (actual engine rotational speed) Ner of the engine 12 is detected by an engine rotational speed sensor (rotational speed detection means) 18 and a deviation constituting an ECU (electric control unit) 20 including a microcomputer as a control means. It is supplied to the detection comparison unit 22.
[0016]
The microcomputer functions as a drive / control / processing / determination unit, and as is well known, a microprocessor (MPU) corresponding to a central processing unit (CPU) and an input / output device connected to the microprocessor. Read-only memory (ROM) in which AD conversion circuit, DA conversion circuit, I / O port, control program / system program / lookup table, etc. are written in advance, random access memory (RAM) for temporarily storing processing data And a read / write memory), a timer circuit, an interrupt processing circuit, and the like are provided as an LSI device integrated on one chip.
[0017]
Output signal (air conditioner on / off signal) from the air conditioner switch (air conditioner operation request input means) 24 as a manual on / off device of the air conditioner (air conditioner) or a control device such as an auto air conditioner (not shown), the rotation speed of the wheel A vehicle speed signal as an output signal of a vehicle speed sensor (vehicle speed detection means) 26 for detecting engine speed, an opening signal as an output signal of a throttle opening sensor (throttle opening detection means) 28 operating in conjunction with an accelerator pedal, engine cooling An idle state determination control unit (ECU 20) that includes a temperature signal as an output signal of the engine water temperature sensor 29 for detecting the water temperature and a gear position position signal that is an output signal of the gear position switch 30 that detects the gear position position ( Idle state determination unit) 32 It is. An air conditioner on / off signal that is an output signal of the air conditioner switch 24 is also supplied to the electromagnetic clutch drive control unit 34.
[0018]
In this case, the idle state determination control unit 32 includes target idle speed setting means 32a for outputting the target idle speed Net during idling, and set deviation value setting means 32b for outputting the set deviation value ΔNt. Is included. As will be described later, when performing so-called idle-up control, the target idle speed setting means 32a may set the target idle speed to a different value when the air conditioning device is returned and stopped. Good.
[0019]
In this embodiment, the electromagnetic clutch control means basically includes a subtraction unit 36 as an error detection means, an absolute value part 42, a comparison part 38 as a deviation comparison means, and a first timer ( The first timer means 40 and a second timer (second timer means) 44 are included.
[0020]
The idle state determination control unit 32 outputs the target idle rotation number Net from the target idle rotation number setting unit 32a to one input port of the subtraction unit 36 constituting the deviation detection comparison unit 22, and a comparison unit (deviation comparison unit). The set deviation value ΔNt is supplied to the 38 reference ports from the set deviation value setting means 32b. In this embodiment, the set deviation value ΔNt is set to ΔNt = 90 rpm. This set deviation value ΔNt is the rotational speed as a deviation for preventing engine vibration, and is different from the rotational speed of the lower limit target value, which is the lower limit value of the rotational speed at which engine stall described in the section of the prior art occurs. Keep in mind.
[0021]
The idle state determination control unit 32 supplies the first time measurement start signal St1 to the first timer 40 that can be configured by a preset down counter, for example. In this embodiment, the preset time of the first timer 40 is set to 10 seconds.
[0022]
In this case, the preset time keeping time (set time) of the first timer 40 is determined in advance by measuring the time until the engine 12 is malfunctioning, and has a margin with respect to the time leading to the malfunction, for example, half the time. It is set to.
[0023]
The other input port of the subtractor 36 is supplied with the actual engine speed Ner, and the absolute signal of the difference signal (deviation) ΔN (ΔN = Net−Ner) between the actual engine speed Ner and the target idle speed Net. The value (deviation) | ΔN | is supplied to the comparison port of the comparison unit 38 via the absolute value unit 42.
[0024]
That is, in this embodiment, the actual engine speed Ner and the target idle speed setting means detected by the engine speed sensor 18 as the rotational speed detection means by the subtraction part 36 and the absolute value part 42 as the deviation detection means. A deviation | ΔN | with respect to the target idle speed Net set by 32a is detected and supplied to the comparison unit 38 as a deviation comparison means. The comparison unit 38 compares the deviation | ΔN | detected by the deviation detection unit with the set deviation value ΔNt set by the set deviation value setting unit 32b.
[0025]
A first timing start signal St1 as an output signal, which is a comparison result signal of the comparison unit 38, is supplied to the first timer 40.
[0026]
A second timing start signal St2, which is an output signal of the first timer 40, is supplied to a second timer 44 constituted by a preset down counter. The second timing start signal St2 is supplied to the electromagnetic clutch drive controller 34 as a signal for disconnecting the electromagnetic clutch 14. In this embodiment, the preset time of the second timer 44 is set to 10 seconds. In this case, the preset timing time (set time) of the second timer 44 is a time obtained by adding a certain margin time to the time measured by the engine 12 to be recovered in advance, and the air conditioning device is inoperative. Therefore, the time is set so that the occupant can maintain a state in which it is not uncomfortable.
[0027]
The output signal of the second timer 44 is supplied to the electromagnetic clutch drive control unit 34 as a connection signal for the electromagnetic clutch 14 in the disconnected state.
[0028]
The electromagnetic clutch drive control unit 34 disconnects or connects the electromagnetic clutch 14 according to the disconnection signal and the connection signal, thereby bringing the compressor 16 and the engine 12 into a disconnected state or a connected state.
[0029]
Next, the operation of the example of FIG. 1 will be described in detail with reference to the flowchart of FIG. Note that the subject of determination, processing, and control is the ECU 20.
[0030]
First, the idle state determination control unit 32 determines the on / off state of the air conditioner switch 24 (step S1). When the air conditioner switch 24 is off, the electromagnetic clutch 14 is disengaged through the electromagnetic clutch drive controller 34 (step S2), and the compressor 16, in other words, the air conditioning device is deactivated. Thereafter, the determination returns to step S1.
[0031]
On the other hand, if the determination in step S1 is affirmative, that is, if the air conditioner switch 24 is on, it is determined whether the automobile 10 is in an idle state (a state where the engine is idling) ( Step S3).
[0032]
In this embodiment, the idle state is determined by determining that the vehicle speed detected by the vehicle speed sensor 26 is zero, in other words, that the automobile 10 is in a stopped state, and that the throttle opening sensor 28 detects the throttle. In the case of a so-called AT (automatic transmisson) vehicle, the gear position switch 30 is in the so-called parking position P or neutral position N, and the engine water temperature is 40 ° C. or higher. Thus, the condition is that the vehicle is not in the fast idle state (warm-up operation mode).
[0033]
In the case of a so-called MT (manual transmission) vehicle, the idle state determination condition is that the gear is in the neutral position instead of the gear position switch 30.
[0034]
When it is determined that the engine is in the idle state, the deviation detection comparison unit 22 sets the actual engine speed (in this case, the actual idle speed) Ner detected by the engine speed sensor 18 and the idle state determination control unit 32. The difference ΔN = Net−Ner absolute value | ΔN | = | Net−Ner | is a set deviation value ΔNt set by the idle state determination control unit 32 (in this embodiment, ΔN = 90 rpm) is determined (step S4).
[0035]
Here, the engine 12 is rotating stably, the deviation | ΔN | between the actual idle speed (actual idle speed) Ner and the target idle speed Net is smaller than the set deviation value ΔNt, and the determination in step S4 Is established.
[0036]
At this time, the first timer 40 is set after the first timer 40 is reset by the first timing start signal St1 output from the comparator 38, and the timer for the preset time (set time) of 10 seconds is started (step S5).
[0037]
Next, the ECU 20 checks whether or not the time measured by the second timer 44 is 0 seconds or during time measurement (time exceeding 0 seconds and less than 10 seconds) (step S6).
[0038]
At this time, since the second timer 44 has not started to measure time, it is 0 second, and this determination is affirmative, and the electromagnetic clutch 14 is controlled through the electromagnetic clutch drive control unit 34 according to the output level of the first timer 40. Is connected (step S7), the compressor 16 is rotated by the engine 12, and the air conditioning device starts operating. Thereafter, the process returns to the determination process in step S1. Note that the time for repeating the processes of steps S1, S3 to S7 or the processes of steps S1 and S2 once is in the order of ms.
[0039]
If it is determined in step S3 described above that the engine is not in the idle state, the first timer 40 is set, and the electromagnetic clutch 14 is directly connected according to the output level, and the air conditioner is activated. A state is set (step S8). Further, each time the process of step S5 or step S8 is performed, the first timer 40 is reset, and the time measurement of 10 seconds is reset, so that the time is counted down from 10 seconds (for example, 10 seconds, 9.9). Seconds, ...) starts.
[0040]
While the processes in the order of steps S1, S3, S4, S5, S6, and S7 are in progress, in other words, when the proper air conditioning control is being performed, the actual idle speed Ner is Consider a case where the deviation ΔN = Net−Ner absolute value | ΔN | = | Net−Ner | from the target idle speed Net is larger than the set deviation value ΔNt (step S4: NO). That is, consider a case where it is determined that the actual idle speed Ner of the engine 12 has exceeded the appropriate range when the air conditioning device is operated during idling.
[0041]
At this time, it is determined whether the time measured by the first timer 40 has exceeded the set time of 10 seconds, that is, whether the output value of the first timer 40 is 0 seconds (step S9).
[0042]
When the time during which the actual idle speed Ner exceeds the appropriate range exceeds 10 seconds, in other words, while performing the repeated processing in the order of steps S1, S3, S4, S9, S6, S7, When the time measured by the first timer 40 exceeds the set time of 10 seconds (step S9: YES), the second time measurement for the time measurement end signal of the first timer 40 to start the time counting down by the second timer 44 is started. The start signal St2 is supplied to the second timer 44, and the second timer 44 starts counting down for 10 seconds (step S10), and the electromagnetic clutch 14 is disconnected by the time measurement end signal (disconnection signal) of the first timer 40. A state is set (step S2).
[0043]
When the electromagnetic clutch 14 is in a disengaged state, the process is repeated in the order of steps S2, S1, S3, S4, S9, and S10.
[0044]
However, when the electromagnetic clutch 14 is disengaged, the load on the engine 12 is reduced, the rotational speed of the engine 12 is increased, and the actual idle rotational speed Ner attempts to return to an appropriate range.
[0045]
When the actual idle speed Ner of the engine 12 returns to an appropriate range and the determination process of step S4 is established, in other words, the difference ΔN = Net−Ner between the actual idle speed Ner and the target idle speed Net. When the absolute value | ΔN | = | Net−Ner | of the value becomes smaller than the set deviation value ΔNt (step S4: YES). Again, the first timer 40 is set and the 10-second down-time is started (step S5).
[0046]
Then, after the second timer 44 is set in step S10 and the electromagnetic clutch 14 is disengaged, when the second timer 44 finishes counting down for 10 seconds, it will be described in detail. Steps S2, S1, S3, When the determination process of step S6 is established at the time point when the second timer 44 finishes counting down for 10 seconds during the repetition of the processes of S4, S5, and S6 (the time measured by the second timer 44 is 10 seconds, that is, The output value of the second timer 44 is 0 seconds), and it is determined that the actual idle speed Ner of the engine 12 has returned to the appropriate range and a sufficient time has elapsed (in this case, 10 seconds of the set time of the second timer 44). To do.
[0047]
At this time, the timing end signal of the second timer 44 is supplied to the electromagnetic clutch 14 via the electromagnetic clutch drive control unit 34 as a connection signal of the disconnected electromagnetic clutch 14, whereby the engine 12 and the compressor 16 are connected. The compressor 16 is operated again by the engine 12 by being connected via the electromagnetic clutch 14, and the air conditioning device is restored to the actual operating state (step S7).
[0048]
Thus, according to the above-described embodiment, when the air conditioner switch 24 is turned on, the engine 12 and the compressor 16 are connected via the electromagnetic clutch 14, and the air conditioning device is in the operating state, the idle state determination is performed. After determining that the automobile 10 is in an idle state by the control unit 32, the actual rotational speed of the engine 12 detected by the engine rotational speed sensor 18 is detected as the actual idle rotational speed Ner.
[0049]
Then, it is detected whether or not the absolute value | ΔN | of the deviation ΔN between the detected actual idle speed Ner and the target idle speed Net is smaller than the set deviation value ΔNt. When this state continues for 10 seconds, an actual abnormal state, for example, an abnormal state is simulated before an engine stall occurs, the electromagnetic clutch 14 is disengaged, and the air conditioning device is turned off. Inactive state (rest state). By controlling in this way, it is possible to prevent an abnormal state such as engine stall from occurring.
[0050]
Next, when the electromagnetic clutch 14 is disengaged by assuming an abnormal state, the second timer 44 starts to count down for 10 seconds. In this state, if the state where the absolute value | ΔN | of the deviation ΔN between the detected actual idle speed Ner and the target idle speed Net is larger than the set deviation value ΔNt continues, the second timer 44 is provided each time. To start a new 10-second downtime.
[0051]
In such a state, when the absolute value | ΔN | of the deviation ΔN between the detected actual idle speed Ner and the target idle speed Net becomes smaller than the set deviation value ΔNt, the second timer 44 When the counted down time reaches 10 seconds, which is the set time, it is determined that the engine 12 has returned to the normal state even when connected to the compressor 16, and the electromagnetic clutch 14 is turned on again. As a result, the air conditioning device is reactivated.
[0052]
That is, according to this embodiment, when the air-conditioning apparatus is in an idle state, when the actual idle speed Ner of the engine 12 deviates from the target speed Net for a certain time (10 seconds), the electromagnetic clutch By automatically cutting 14, it is possible to avoid the occurrence of an abnormal state such as an engine stall, the vibration of the vehicle body, and the occurrence of a booming sound based on this vibration. Moreover, the state where the state of the engine 12 is sufficiently recovered and the deviation between the actual idle speed Ner and the target idle speed Net of the engine 12 is within a certain value (step S4: YES) is a certain time (10 seconds). When continuing, the engine 12 and the compressor 16 are automatically connected to bring the air conditioning device into an operating state. By controlling in this way, the effect that the inactive period of the air conditioning device can be made extremely short is achieved.
[0053]
In the above-described embodiment, the target idle speed Net, the set deviation value ΔNt, the set time set in the first timer 40, and the set time set in the second timer 44 are desired through input means (not shown). Can be set to a value of.
[0054]
Moreover, in the above-described embodiment, since it becomes complicated, the relationship with so-called idle up control is not mentioned, but the air conditioning device is in an operating state (step S1: YES) and is in an idle state. When (step S3: YES), the idle speed control valve (ISCV) (not shown) is feedback-controlled to open and close according to the load of the air conditioning device, and the air amount in the bypass passage is adjusted to idle rotation. Idle-up control that increases the number can be used in combination. When the idle-up control is used together, the target idle speed Net set by the target idle speed setting means 32a is, for example, 1050 rpm when the air conditioning device is returned from the non-operating state (stopped state) to the operating state. When the operation state is changed to the stop state, different values such as 800 rpm may be set, and both may be set to the same value of 800 rpm. These set values can be determined by the output characteristics of the engine 12.
[0055]
In addition, the present invention is not limited to the above-described embodiment, and it is needless to say that various configurations can be adopted without departing from the gist of the present invention.
[0056]
【The invention's effect】
As described above, according to the present invention, when the state where the deviation between the target idle speed and the actual idle speed is larger than the set deviation value continues for a set time, the electromagnetic clutch is disconnected and the air conditioning device is Not operating.
[0057]
For this reason, the engine speed at which the air conditioning device is deactivated can be set higher than the conventional target value, and the engine speed is such that the actual idle speed of the engine does not reach the lower limit target value of the idle speed. Will not continue for a long time, and as a result, it is possible to avoid the occurrence of the vibration of the vehicle body due to the vibration of the engine and the occurrence of the humming noise in the passenger compartment caused by this vibration. .
[0058]
Thus, according to the present invention, the on-off control of the in-vehicle air conditioning device can be effectively performed during idling.
[0059]
Therefore, the derivative effect that the evaluation of the functionality of the vehicle to which the present invention is applied becomes high is achieved.
[0060]
Further, according to the present invention, when the time period during which the deviation between the target idle speed and the actual idle speed is greater than the set deviation value continues for a set time, the electromagnetic clutch is disconnected and the air conditioning device is deactivated. Thereafter, when the deviation becomes smaller than the set deviation value and the reduced time continues for the set time, the electromagnetic clutch is connected to return the air conditioning device to the operating state.
[0061]
For this reason, when the load applied to the air-conditioning apparatus as in the prior art is large and the load applied to the engine is also large, the engine speed is set at the air conditioner on (upper limit target value) off (lower limit target value). Hunting caused by fluctuations between the target idle speed and the actual idle speed is prevented by using the deviation between the target idle speed and the actual idle speed, so that the idle-up control can be performed without being complicated as in the prior art. . In addition, since the air conditioner will not stop even if the engine speed temporarily falls below the lower limit for some reason while the air conditioner is operating under a small load, the air conditioner has been It is operated continuously, air conditioning in the passenger compartment is maintained, and comfort is not impaired.
[0062]
Furthermore, since the engine speed at which the air conditioning device is deactivated can be set higher than the conventional lower limit target value, the engine speed at which the actual idle speed of the engine does not reach the lower limit target value of the idle speed is long. As a result, it is possible to avoid the occurrence of the vibration of the vehicle body due to the vibration of the engine and the occurrence of the humming noise in the vehicle interior caused by this vibration. When the state where the deviation between the idle speed and the target idle speed is smaller than the set deviation value continues for a set time, the air conditioner can be set to automatically return to the operating state again in a short time, so the air conditioner The usability of is greatly improved.
[0063]
As a result, the time during which the air conditioning device is inoperative is shortened, the air conditioning in the vehicle interior is maintained, the comfort is not impaired, and the on-off control of the in-vehicle air conditioning device can be effectively performed during idling.
[0064]
Therefore, the derivative effect that the evaluation of the functionality of the vehicle to which the present invention is applied becomes higher is achieved.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a schematic configuration of an automobile to which an embodiment of the present invention is applied.
FIG. 2 is a flowchart for explaining the operation of the example in FIG. 1;
[Explanation of symbols]
10 ... car 12 ... engine
14 ... Electromagnetic clutch 16 ... Compressor
18 ... Engine speed sensor 20 ... ECU
32 ... Idle state determination control unit 36 ... Subtraction unit
38 ... Comparator 40 ... First timer
42 ... Absolute value part 44 ... Second timer
Ner ... Actual idle speed Net ... Target idle speed
St1 ... First timing start signal St2 ... Second timing start signal
ΔN ... deviation | ΔN | ... absolute value of deviation
ΔNt: Setting deviation value

Claims (2)

A compressor coupled to the vehicle engine and driven;
An electromagnetic clutch connecting the compressor and the vehicle engine;
A rotational speed detection means for detecting the rotational speed of the vehicle engine;
Target idle speed setting means for setting a target idle speed at the time of idling operation of the vehicle engine;
Air conditioning for vehicles, comprising: electromagnetic clutch control means for controlling connection of the electromagnetic clutch based on the rotational speed detected by the rotational speed detection means and the target idle rotational speed set by the target idle rotational speed setting means A control device for the device,
The electromagnetic clutch control means includes
Deviation detecting means for detecting a deviation between the rotational speed detected by the rotational speed detecting means and the target rotational speed set by the target idle rotational speed setting means;
Deviation comparing means for comparing the deviation detected by the deviation detecting means with a predetermined set deviation value;
According to the comparison result of the deviation comparison means, and a time measuring means for measuring a predetermined set time,
The timing means is
A control device for an air conditioning apparatus for a vehicle, wherein the electromagnetic clutch disengagement signal is generated after a state in which the deviation detected by the deviation detecting means is larger than the set deviation value continues for the set time. A compressor coupled to the vehicle engine and driven;
An electromagnetic clutch connecting the compressor and the vehicle engine;
A rotational speed detection means for detecting the rotational speed of the vehicle engine;
Target idle speed setting means for setting a target idle speed at the time of idling operation of the vehicle engine;
Air conditioning for vehicles, comprising: electromagnetic clutch control means for controlling connection of the electromagnetic clutch based on the rotational speed detected by the rotational speed detection means and the target idle rotational speed set by the target idle rotational speed setting means A control device for the device,
The electromagnetic clutch control means includes
Deviation detecting means for detecting a deviation between the rotational speed detected by the rotational speed detecting means and the target rotational speed set by the target idle rotational speed setting means;
Deviation comparing means for comparing the deviation detected by the deviation detecting means with a predetermined set deviation value;
First and second timing means for timing predetermined first and second set times according to the comparison result of the deviation comparison means,
The first time measuring means includes
After a state in which the deviation detected by the deviation detecting means is larger than the set deviation value continues for the first set time, a disconnection signal for the electromagnetic clutch is generated,
The second time measuring means includes
After the electromagnetic clutch is disengaged, the deviation detected by the deviation detecting means is smaller than the set deviation value, and the state where the deviation is smaller than the set deviation value continues for the second set time, and then the electromagnetic clutch A control device for a vehicle air-conditioning device, characterized in that a connection signal is generated.

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